Regensburg 2013 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 9: Poster: Microanalysis and Microscopy

MI 9.4: Poster

Mittwoch, 13. März 2013, 15:00–17:00, Poster B2

Novel techniques and applications in (C)DB-spectroscopy at the NEPOMUC positron beam — •Markus Reiner¹, Benjamin Löwe², Philip Pikart¹, and Christoph Hugenschmidt¹ — ¹Technische Universität München, Physik-Department E21 und FRM II, 85748 Garching — ²Universität der Bundeswehr München, Institut für Angewandte Physik und Messtechnik LRT2, 85577 Neubiberg

In (Coincident) Doppler Broadening Spectroscopy ((C)DBS) the positron is used as a nanoprobe, which is highly sensitive to open volume defects, vacancy-atom complexes and atom clusters of higher positron affinity. The coincident detection of the Doppler shifted annihilation quanta enables the characterization of the chemical vicinity of the annihilation site. The high intensity positron beam NEPOMUC at the FRM II has been successfully used for depth dependent and in-situ investigations at high temperatures. Due to the short measurement times, CDBS at NEPOMUC enables novel applications like studies on thin film annealing and alloying. Currently, a new sample heating device is installed in order to allow in-situ measurements at temperatures up to 1300 K. Furthermore, a new detector system of two pixelated HPGe detectors is set up and will be used for the 3D detection of electron momenta. Within this contribution, recent measurements as well as new developments at the CDB-spectrometer will be presented. Financial support within the project no. 05KI0WOB by the BMBF is gratefully acknowledged.